int
platform_start_ap(int cpuid)
{
uint64_t cores_in_reset;
/*
* Release the core if it is in reset, and let it rev up a bit.
* The real synchronization happens below via octeon_ap_boot.
*/
cores_in_reset = cvmx_read_csr(CVMX_CIU_PP_RST);
if (cores_in_reset & (1ULL << cpuid)) {
if (bootverbose)
printf ("AP #%d still in reset\n", cpuid);
cores_in_reset &= ~(1ULL << cpuid);
cvmx_write_csr(CVMX_CIU_PP_RST, (uint64_t)(cores_in_reset));
DELAY(2000); /* Give it a moment to start */
}
if (atomic_cmpset_32(&octeon_ap_boot, ~0, cpuid) == 0)
return (-1);
for (;;) {
DELAY(1000);
if (atomic_cmpset_32(&octeon_ap_boot, 0, ~0) != 0)
return (0);
printf("Waiting for cpu%d to start\n", cpuid);
}
}
static void
syscall_thread_drain(struct sysent *se)
{
u_int32_t cnt, oldcnt;
do {
oldcnt = se->sy_thrcnt;
KASSERT((oldcnt & SY_THR_STATIC) == 0,
("drain on static syscall"));
cnt = oldcnt | SY_THR_DRAINING;
} while (atomic_cmpset_acq_32(&se->sy_thrcnt, oldcnt, cnt) == 0);
while (atomic_cmpset_32(&se->sy_thrcnt, SY_THR_DRAINING,
SY_THR_ABSENT) == 0)
pause("scdrn", hz/2);
}
static void
nvme_notify(struct nvme_consumer *cons,
struct nvme_controller *ctrlr)
{
struct nvme_namespace *ns;
void *ctrlr_cookie;
int cmpset, ns_idx;
/*
* The consumer may register itself after the nvme devices
* have registered with the kernel, but before the
* driver has completed initialization. In that case,
* return here, and when initialization completes, the
* controller will make sure the consumer gets notified.
*/
if (!ctrlr->is_initialized)
return;
cmpset = atomic_cmpset_32(&ctrlr->notification_sent, 0, 1);
if (cmpset == 0)
return;
if (cons->ctrlr_fn != NULL)
ctrlr_cookie = (*cons->ctrlr_fn)(ctrlr);
else
ctrlr_cookie = NULL;
ctrlr->cons_cookie[cons->id] = ctrlr_cookie;
if (ctrlr->is_failed) {
if (cons->fail_fn != NULL)
(*cons->fail_fn)(ctrlr_cookie);
/*
* Do not notify consumers about the namespaces of a
* failed controller.
*/
return;
}
for (ns_idx = 0; ns_idx < ctrlr->cdata.nn; ns_idx++) {
ns = &ctrlr->ns[ns_idx];
if (cons->ns_fn != NULL)
ns->cons_cookie[cons->id] =
(*cons->ns_fn)(ns, ctrlr_cookie);
}
}
static inline void
_ioat_putn(struct ioat_softc *ioat, uint32_t n, enum ioat_ref_kind kind,
boolean_t locked)
{
uint32_t old;
KASSERT(kind < IOAT_NUM_REF_KINDS, ("bogus"));
if (n == 0)
return;
#ifdef INVARIANTS
old = atomic_fetchadd_32(&ioat->refkinds[kind], -n);
KASSERT(old >= n, ("refcnt kind underflow"));
#endif
/* Skip acquiring the lock if resulting refcnt > 0. */
for (;;) {
old = ioat->refcnt;
if (old <= n)
break;
if (atomic_cmpset_32(&ioat->refcnt, old, old - n))
return;
}
if (locked)
mtx_assert(IOAT_REFLK, MA_OWNED);
else
mtx_lock(IOAT_REFLK);
old = atomic_fetchadd_32(&ioat->refcnt, -n);
KASSERT(old >= n, ("refcnt error"));
if (old == n)
wakeup(IOAT_REFLK);
if (!locked)
mtx_unlock(IOAT_REFLK);
}